Hot Deployment Exhausts the PermGen or Metaspace when the Application Includes Database Drivers

Issue

• We're bundling our database driver in our application's WEB-INF/lib directory. After a couple hot deployments of this application, JBoss throws an "OutOfMemoryError: PermGen space".
• The heap dump shows classloaders are building up. The leaked classloaders trace back to the driver classes stored in the writeDrivers Vector of the java.sql.DriverManager system class.